Upload & Sell: Off
If there is a problem that can't be handled via profiles, it would be more likely to be the sensor itself - the actual colors of the dyes used in the Bayer filter. E.g., not enough separation between colors to reconstruct a clean end result - to the extent that the sensor is mushing colors together (metamerism), then neither firmware nor the raw developer can completely recover the situation - lost information is lost forever.
A quote from LUF, This is exact the issue I am worried for 6D's file. All those Low light performance is market crap at the expense of color separation. It will not affect regular people, or even JPEG shooter, but more serious hobbyist or professional.
In the mean time, one from yesterday
6D with 50cron WO